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Comet 17P/Holmes underwent a dramatic outburst in October 2007, caused by thesudden fragmentation of its nucleus and the production of a large quantity ofgrains scattering sunlight. We report on 90 GHz continuum observations carriedout with the IRAM Plateau de Bure interferometer on 27.1 and 28.2 October 2007UT, i.e., 4-5 days after the outburst. These observations probed the thermalradiation of large dust particles, and therefore provide the best constraintson the mass in the ejecta debris. The thermal emission of the debris wasmodelled and coupled to a time-dependent description of their expansion afterthe outburst. The analysis was performed in the Fourier plane. Visibilitieswere computed for the two observing dates and compared to the data to measuretheir velocity and mass. Optical data and 250-GHz continuum measurementspublished in the literature were used to further constrain the dust kinematicsand size distribution. Two distinct dust components in terms of kinematicproperties are identified in the data. The large-velocity component, withtypical velocities V0 of 50-100 m/s for 1 mm particles, displays a steep sizedistribution with a size index estimated to q = -3.7 (\pm0.1), assuming aminimum grain size of 0.1 \mum. It corresponds to the fast expanding shellobserved in optical images. The slowly-moving "core" component (V0 = 7-9 m/s)detected near the nucleus has a size index |q| < 3.4 and contains a higherproportion of large particles than the shell. The dust mass in the core is inthe range 0.1-1 that of the shell. Using optical constants pertaining to porousgrains (50% porosity) made of astronomical silicates mixed with water ice (48%in mass), the total dust mass Mdust injected by the outburst is estimated to4-14 x 10**11 kg, corresponding to 3-9% the nucleus mass.

Interferometric mapping of the 3.3-mm continuum emission of comet 17P/Holmes after its 2007 outburst